code: def on_draw(self, event):
      gloo.clear()
      self.program.draw("line_strip")
  
file_path: vispy/examples/demo/gloo/realtime_signals.py
imports: from vispy import gloo
  from vispy import app
  import numpy
  import math
label_desc: Use image node_id 5 for calling the Canvas obj's underlying member method code with example usage: obj.on_draw(event) without return types